style.css

body {
    font-size: 12px;
    font-family: "Helvetica Neue", HelveticaNeue, Helvetica;
    background: rgb(155,141,113) url(texture.jpg);
    margin: 0;
    overflow: auto;
}

a[href^="http://github.com/"] {
    position: fixed;
    top:0;
    right:10px;
    z-index: 4;
    background: hsla(0,0%,100%,0.8);
    background: -webkit-linear-gradient(hsla(0,0%,100%,1.0), hsla(0,0%,80%,1.0));
    background: -moz-linear-gradient(hsla(0,0%,100%,1.0), hsla(0,0%,80%,1.0));
    border-radius: 0 0 2px 2px;
    padding: 8px;
    box-shadow: 0 0 4px hsla(0,0%,0%,0.4);
    color:#666;
    font-weight:bold;
    text-decoration:none;
    text-shadow: 0 1px 0 hsla(0,0%,100%,1.0);
}
a[href^="http://github.com/"]:hover {
    color: hsla(0,50%,50%,1.0);
}
a[href^="http://github.com/"]:focus {
    color: hsla(0,50%,50%,1.0s);
    background: -webkit-linear-gradient(hsla(0,0%,80%,1.0), hsla(0,0%,85%,1.0) 40%, hsla(0,0%,95%,1.0));
    background: -moz-linear-gradient(hsla(0,0%,80%,1.0), hsla(0,0%,85%,1.0) 40%, hsla(0,0%,95%,1.0));
    box-shadow: inset 0 -1px 2px hsla(0,0%,0%,0.5), 0 1px 2px hsla(0,0%,100%,0.4);
}

#app {
    position:absolute;
    top:0;
    bottom:0;
    right:0;
    left:0;
    overflow:auto;
    -webkit-overflow-scrolling: touch;
    background: url(circles.png) no-repeat bottom left;
    padding: 30px;
    color: #222;
    line-height: 1.5;
    font-size: 16px;
    text-shadow: 0 1px 0 hsla(0,0%,100%,0.3);
}

#app p a {
    background: hsla(0,0%,100%,0.5);
    border: 1px solid hsla(0,0%,100%,0.6);
    border-radius:2px;
    padding: 0 3px;
    color: #333;
}

h1 {
    margin: 20px 0;
    padding: 0;
    font-weight: normal;
    text-shadow: 0 1px 0 hsla(0,0%,100%,0.5);
}

h2 {
    margin: 40px 0 10px;
    padding:0;
    font-weight: normal;
    text-shadow: 0 1px 0 hsla(0,0%,100%,0.5);
}

pre {
    background: hsla(0,0%,100%,0.3);
    border-radius: 2px;
    border: 1px solid hsla(0,0%,100%,0.35);
    padding: 20px;
    margin: 20px 0;
    overflow: auto;
}

p {
    margin: 20px 0;
    padding: 0;
}

@media screen and (-webkit-device-pixel-ratio:2) {    
    #app {
        background: url(circles@2x.png) no-repeat bottom left;
        background-size: 400px 400px;
        padding-bottom: 40px;
    }
    
    body {
        background: rgb(155,141,113) url(wood@2x.jpg);
        background-size: 320px 480px;
    }
}

@media screen and (-webkit-device-pixel-ratio:1) and (max-device-width:480px) {
    #app {
        background: url(circles.png) no-repeat bottom left;
        padding-bottom: 40px;
    }
    
    body {
        background:rgb(155,141,113) url(wood@2x.jpg);
        background-size: 320px 480px;
    }
    
}

nav#arc {
    position:fixed;
    bottom: 30px;
    left: 30px;
    background:#F00;
}

nav#full {
    position: relative;
    margin-left: 50%;
}

a {
    -webkit-tap-highlight-color:hsla(0,0%,0%,0.0);
}

nav > a {
    position: absolute;
    width: 40px;
    height: 40px;
    background: #F00;
    background: -webkit-linear-gradient(hsla(0,100%,50%,1.0), hsla(0,100%,43%,1.0) 50%, hsla(0,100%,37%,1.0) 50%, hsla(0,100%,30%,1.0));
    background: -moz-linear-gradient(hsla(0,100%,50%,1.0), hsla(0,100%,43%,1.0) 50%, hsla(0,100%,37%,1.0) 50%, hsla(0,100%,30%,1.0));
    bottom: -23px;
    left: -23px;
    z-index: 2;
    border-radius:40px;
    font-size: 38px;
    font-weight:bold;
    font-family: "Helvetica Neue", HelveticaNeue;
    text-align:center;
    line-height:30px;
    color:#FFF;
    text-decoration:none;
    border:3px solid #FFF;
    box-shadow: 0 0 2px hsla(0,0%,0%,0.6);
}

nav ul {
    padding:0;
    margin:0;
    list-style-type:none;
}

nav li {
    position:absolute;
    left:-16px;
    top:-16px;
}

nav li a {
    font-size: 18px;
    font-weight:normal;
    border: 3px solid #FFF;
    box-shadow: inset 0 0 4px hsla(0,0%,0%,1.0), 0 0 2px hsla(0,0%,0%,0.6);
    text-shadow: 0 0 2px hsla(0,0%,0%,1.0);
    width: 27px;
    height: 27px;
    background:#444;
    position: absolute;
    top:0;
    left:0;
    overflow:hidden;
    color:#FFF;
    border-radius:26px;
    line-height: 24px;
    text-align: center;
    text-decoration:none;
    font-weight:bold;
}